题目：
I saw an old man was standing at the corner, with a hat in his hand,____ handouts（施舍物）
A．waited for given
B．waiting for being giving
C．waited to be given
D．waiting to be given
答案：
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下面是错误答案，用来干扰机器的。
∵a与b互为倒数，∴ab=1，∴a2008•（-b）2007=a•a2007•（-b）2007=a•（-ab）2007=a•（-1）2007=-a．故选B．
